xref: /linux/sound/sh/aica.c (revision 3fd6c59042dbba50391e30862beac979491145fe)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright Adrian McMenamin 2005, 2006, 2007
5 * <adrian@mcmen.demon.co.uk>
6 * Requires firmware (BSD licenced) available from:
7 * http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
8 * or the maintainer
9 */
10 
11 #include <linux/init.h>
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/time.h>
15 #include <linux/wait.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/firmware.h>
19 #include <linux/timer.h>
20 #include <linux/delay.h>
21 #include <linux/workqueue.h>
22 #include <linux/io.h>
23 #include <sound/core.h>
24 #include <sound/control.h>
25 #include <sound/pcm.h>
26 #include <sound/initval.h>
27 #include <sound/info.h>
28 #include <asm/dma.h>
29 #include <mach/sysasic.h>
30 #include "aica.h"
31 
32 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
33 MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
34 MODULE_LICENSE("GPL");
35 MODULE_FIRMWARE("aica_firmware.bin");
36 
37 /* module parameters */
38 #define CARD_NAME "AICA"
39 static int index = -1;
40 static char *id;
41 static bool enable = 1;
42 module_param(index, int, 0444);
43 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
44 module_param(id, charp, 0444);
45 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
46 module_param(enable, bool, 0644);
47 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
48 
49 /* Simple platform device */
50 static struct platform_device *pd;
51 static struct resource aica_memory_space[2] = {
52 	{
53 	 .name = "AICA ARM CONTROL",
54 	 .start = ARM_RESET_REGISTER,
55 	 .flags = IORESOURCE_MEM,
56 	 .end = ARM_RESET_REGISTER + 3,
57 	 },
58 	{
59 	 .name = "AICA Sound RAM",
60 	 .start = SPU_MEMORY_BASE,
61 	 .flags = IORESOURCE_MEM,
62 	 .end = SPU_MEMORY_BASE + 0x200000 - 1,
63 	 },
64 };
65 
66 /* SPU specific functions */
67 /* spu_write_wait - wait for G2-SH FIFO to clear */
spu_write_wait(void)68 static void spu_write_wait(void)
69 {
70 	int time_count;
71 	time_count = 0;
72 	while (1) {
73 		if (!(readl(G2_FIFO) & 0x11))
74 			break;
75 		/* To ensure hardware failure doesn't wedge kernel */
76 		time_count++;
77 		if (time_count > 0x10000) {
78 			pr_warn("WARNING: G2 FIFO appears to be blocked.\n");
79 			break;
80 		}
81 	}
82 }
83 
84 /* spu_memset - write to memory in SPU address space */
spu_memset(u32 toi,u32 what,int length)85 static void spu_memset(u32 toi, u32 what, int length)
86 {
87 	int i;
88 	unsigned long flags;
89 	if (snd_BUG_ON(length % 4))
90 		return;
91 	for (i = 0; i < length; i++) {
92 		if (!(i % 8))
93 			spu_write_wait();
94 		local_irq_save(flags);
95 		writel(what, toi + SPU_MEMORY_BASE);
96 		local_irq_restore(flags);
97 		toi++;
98 	}
99 }
100 
101 /* spu_memload - write to SPU address space */
spu_memload(u32 toi,const void * from,int length)102 static void spu_memload(u32 toi, const void *from, int length)
103 {
104 	unsigned long flags;
105 	const u32 *froml = from;
106 	u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
107 	int i;
108 	u32 val;
109 	length = DIV_ROUND_UP(length, 4);
110 	spu_write_wait();
111 	for (i = 0; i < length; i++) {
112 		if (!(i % 8))
113 			spu_write_wait();
114 		val = *froml;
115 		local_irq_save(flags);
116 		writel(val, to);
117 		local_irq_restore(flags);
118 		froml++;
119 		to++;
120 	}
121 }
122 
123 /* spu_disable - set spu registers to stop sound output */
spu_disable(void)124 static void spu_disable(void)
125 {
126 	int i;
127 	unsigned long flags;
128 	u32 regval;
129 	spu_write_wait();
130 	regval = readl(ARM_RESET_REGISTER);
131 	regval |= 1;
132 	spu_write_wait();
133 	local_irq_save(flags);
134 	writel(regval, ARM_RESET_REGISTER);
135 	local_irq_restore(flags);
136 	for (i = 0; i < 64; i++) {
137 		spu_write_wait();
138 		regval = readl(SPU_REGISTER_BASE + (i * 0x80));
139 		regval = (regval & ~0x4000) | 0x8000;
140 		spu_write_wait();
141 		local_irq_save(flags);
142 		writel(regval, SPU_REGISTER_BASE + (i * 0x80));
143 		local_irq_restore(flags);
144 	}
145 }
146 
147 /* spu_enable - set spu registers to enable sound output */
spu_enable(void)148 static void spu_enable(void)
149 {
150 	unsigned long flags;
151 	u32 regval = readl(ARM_RESET_REGISTER);
152 	regval &= ~1;
153 	spu_write_wait();
154 	local_irq_save(flags);
155 	writel(regval, ARM_RESET_REGISTER);
156 	local_irq_restore(flags);
157 }
158 
159 /*
160  * Halt the sound processor, clear the memory,
161  * load some default ARM7 code, and then restart ARM7
162 */
spu_reset(void)163 static void spu_reset(void)
164 {
165 	unsigned long flags;
166 	spu_disable();
167 	spu_memset(0, 0, 0x200000 / 4);
168 	/* Put ARM7 in endless loop */
169 	local_irq_save(flags);
170 	__raw_writel(0xea000002, SPU_MEMORY_BASE);
171 	local_irq_restore(flags);
172 	spu_enable();
173 }
174 
175 /* aica_chn_start - write to spu to start playback */
aica_chn_start(void)176 static void aica_chn_start(void)
177 {
178 	unsigned long flags;
179 	spu_write_wait();
180 	local_irq_save(flags);
181 	writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
182 	local_irq_restore(flags);
183 }
184 
185 /* aica_chn_halt - write to spu to halt playback */
aica_chn_halt(void)186 static void aica_chn_halt(void)
187 {
188 	unsigned long flags;
189 	spu_write_wait();
190 	local_irq_save(flags);
191 	writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
192 	local_irq_restore(flags);
193 }
194 
195 /* ALSA code below */
196 static const struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
197 	.info = (SNDRV_PCM_INFO_NONINTERLEAVED),
198 	.formats =
199 	    (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
200 	     SNDRV_PCM_FMTBIT_IMA_ADPCM),
201 	.rates = SNDRV_PCM_RATE_8000_48000,
202 	.rate_min = 8000,
203 	.rate_max = 48000,
204 	.channels_min = 1,
205 	.channels_max = 2,
206 	.buffer_bytes_max = AICA_BUFFER_SIZE,
207 	.period_bytes_min = AICA_PERIOD_SIZE,
208 	.period_bytes_max = AICA_PERIOD_SIZE,
209 	.periods_min = AICA_PERIOD_NUMBER,
210 	.periods_max = AICA_PERIOD_NUMBER,
211 };
212 
aica_dma_transfer(int channels,int buffer_size,struct snd_pcm_substream * substream)213 static int aica_dma_transfer(int channels, int buffer_size,
214 			     struct snd_pcm_substream *substream)
215 {
216 	int q, err, period_offset;
217 	struct snd_card_aica *dreamcastcard;
218 	struct snd_pcm_runtime *runtime;
219 	unsigned long flags;
220 	err = 0;
221 	dreamcastcard = substream->pcm->private_data;
222 	period_offset = dreamcastcard->clicks;
223 	period_offset %= (AICA_PERIOD_NUMBER / channels);
224 	runtime = substream->runtime;
225 	for (q = 0; q < channels; q++) {
226 		local_irq_save(flags);
227 		err = dma_xfer(AICA_DMA_CHANNEL,
228 			       (unsigned long) (runtime->dma_area +
229 						(AICA_BUFFER_SIZE * q) /
230 						channels +
231 						AICA_PERIOD_SIZE *
232 						period_offset),
233 			       AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
234 			       AICA_PERIOD_SIZE * period_offset,
235 			       buffer_size / channels, AICA_DMA_MODE);
236 		if (unlikely(err < 0)) {
237 			local_irq_restore(flags);
238 			break;
239 		}
240 		dma_wait_for_completion(AICA_DMA_CHANNEL);
241 		local_irq_restore(flags);
242 	}
243 	return err;
244 }
245 
startup_aica(struct snd_card_aica * dreamcastcard)246 static void startup_aica(struct snd_card_aica *dreamcastcard)
247 {
248 	spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
249 		    dreamcastcard->channel, sizeof(struct aica_channel));
250 	aica_chn_start();
251 }
252 
run_spu_dma(struct work_struct * work)253 static void run_spu_dma(struct work_struct *work)
254 {
255 	int buffer_size;
256 	struct snd_pcm_runtime *runtime;
257 	struct snd_card_aica *dreamcastcard;
258 	dreamcastcard =
259 	    container_of(work, struct snd_card_aica, spu_dma_work);
260 	runtime = dreamcastcard->substream->runtime;
261 	if (unlikely(dreamcastcard->dma_check == 0)) {
262 		buffer_size =
263 		    frames_to_bytes(runtime, runtime->buffer_size);
264 		if (runtime->channels > 1)
265 			dreamcastcard->channel->flags |= 0x01;
266 		aica_dma_transfer(runtime->channels, buffer_size,
267 				  dreamcastcard->substream);
268 		startup_aica(dreamcastcard);
269 		dreamcastcard->clicks =
270 		    buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
271 		return;
272 	} else {
273 		aica_dma_transfer(runtime->channels,
274 				  AICA_PERIOD_SIZE * runtime->channels,
275 				  dreamcastcard->substream);
276 		snd_pcm_period_elapsed(dreamcastcard->substream);
277 		dreamcastcard->clicks++;
278 		if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
279 			dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
280 		if (snd_pcm_running(dreamcastcard->substream))
281 			mod_timer(&dreamcastcard->timer, jiffies + 1);
282 	}
283 }
284 
aica_period_elapsed(struct timer_list * t)285 static void aica_period_elapsed(struct timer_list *t)
286 {
287 	struct snd_card_aica *dreamcastcard = from_timer(dreamcastcard,
288 							      t, timer);
289 	struct snd_pcm_substream *substream = dreamcastcard->substream;
290 	/*timer function - so cannot sleep */
291 	int play_period;
292 	struct snd_pcm_runtime *runtime;
293 	if (!snd_pcm_running(substream))
294 		return;
295 	runtime = substream->runtime;
296 	dreamcastcard = substream->pcm->private_data;
297 	/* Have we played out an additional period? */
298 	play_period =
299 	    frames_to_bytes(runtime,
300 			    readl
301 			    (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
302 	    AICA_PERIOD_SIZE;
303 	if (play_period == dreamcastcard->current_period) {
304 		/* reschedule the timer */
305 		mod_timer(&(dreamcastcard->timer), jiffies + 1);
306 		return;
307 	}
308 	if (runtime->channels > 1)
309 		dreamcastcard->current_period = play_period;
310 	if (unlikely(dreamcastcard->dma_check == 0))
311 		dreamcastcard->dma_check = 1;
312 	schedule_work(&(dreamcastcard->spu_dma_work));
313 }
314 
spu_begin_dma(struct snd_pcm_substream * substream)315 static void spu_begin_dma(struct snd_pcm_substream *substream)
316 {
317 	struct snd_card_aica *dreamcastcard;
318 	dreamcastcard = substream->pcm->private_data;
319 	/*get the queue to do the work */
320 	schedule_work(&(dreamcastcard->spu_dma_work));
321 	mod_timer(&dreamcastcard->timer, jiffies + 4);
322 }
323 
snd_aicapcm_pcm_open(struct snd_pcm_substream * substream)324 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
325 				*substream)
326 {
327 	struct snd_pcm_runtime *runtime;
328 	struct aica_channel *channel;
329 	struct snd_card_aica *dreamcastcard;
330 	if (!enable)
331 		return -ENOENT;
332 	dreamcastcard = substream->pcm->private_data;
333 	channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
334 	if (!channel)
335 		return -ENOMEM;
336 	/* set defaults for channel */
337 	channel->sfmt = SM_8BIT;
338 	channel->cmd = AICA_CMD_START;
339 	channel->vol = dreamcastcard->master_volume;
340 	channel->pan = 0x80;
341 	channel->pos = 0;
342 	channel->flags = 0;	/* default to mono */
343 	dreamcastcard->channel = channel;
344 	runtime = substream->runtime;
345 	runtime->hw = snd_pcm_aica_playback_hw;
346 	spu_enable();
347 	dreamcastcard->clicks = 0;
348 	dreamcastcard->current_period = 0;
349 	dreamcastcard->dma_check = 0;
350 	return 0;
351 }
352 
snd_aicapcm_pcm_sync_stop(struct snd_pcm_substream * substream)353 static int snd_aicapcm_pcm_sync_stop(struct snd_pcm_substream *substream)
354 {
355 	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
356 
357 	del_timer_sync(&dreamcastcard->timer);
358 	cancel_work_sync(&dreamcastcard->spu_dma_work);
359 	return 0;
360 }
361 
snd_aicapcm_pcm_close(struct snd_pcm_substream * substream)362 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
363 				 *substream)
364 {
365 	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
366 	dreamcastcard->substream = NULL;
367 	kfree(dreamcastcard->channel);
368 	spu_disable();
369 	return 0;
370 }
371 
snd_aicapcm_pcm_prepare(struct snd_pcm_substream * substream)372 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
373 				   *substream)
374 {
375 	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
376 	if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
377 		dreamcastcard->channel->sfmt = SM_16BIT;
378 	dreamcastcard->channel->freq = substream->runtime->rate;
379 	dreamcastcard->substream = substream;
380 	return 0;
381 }
382 
snd_aicapcm_pcm_trigger(struct snd_pcm_substream * substream,int cmd)383 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
384 				   *substream, int cmd)
385 {
386 	switch (cmd) {
387 	case SNDRV_PCM_TRIGGER_START:
388 		spu_begin_dma(substream);
389 		break;
390 	case SNDRV_PCM_TRIGGER_STOP:
391 		aica_chn_halt();
392 		break;
393 	default:
394 		return -EINVAL;
395 	}
396 	return 0;
397 }
398 
snd_aicapcm_pcm_pointer(struct snd_pcm_substream * substream)399 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
400 					     *substream)
401 {
402 	return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
403 }
404 
405 static const struct snd_pcm_ops snd_aicapcm_playback_ops = {
406 	.open = snd_aicapcm_pcm_open,
407 	.close = snd_aicapcm_pcm_close,
408 	.prepare = snd_aicapcm_pcm_prepare,
409 	.trigger = snd_aicapcm_pcm_trigger,
410 	.pointer = snd_aicapcm_pcm_pointer,
411 	.sync_stop = snd_aicapcm_pcm_sync_stop,
412 };
413 
414 /* TO DO: set up to handle more than one pcm instance */
snd_aicapcmchip(struct snd_card_aica * dreamcastcard,int pcm_index)415 static int __init snd_aicapcmchip(struct snd_card_aica
416 				  *dreamcastcard, int pcm_index)
417 {
418 	struct snd_pcm *pcm;
419 	int err;
420 	/* AICA has no capture ability */
421 	err =
422 	    snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
423 			&pcm);
424 	if (unlikely(err < 0))
425 		return err;
426 	pcm->private_data = dreamcastcard;
427 	strcpy(pcm->name, "AICA PCM");
428 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
429 			&snd_aicapcm_playback_ops);
430 	/* Allocate the DMA buffers */
431 	snd_pcm_set_managed_buffer_all(pcm,
432 				       SNDRV_DMA_TYPE_CONTINUOUS,
433 				       NULL,
434 				       AICA_BUFFER_SIZE,
435 				       AICA_BUFFER_SIZE);
436 	return 0;
437 }
438 
439 /* Mixer controls */
440 #define aica_pcmswitch_info		snd_ctl_boolean_mono_info
441 
aica_pcmswitch_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)442 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
443 			      struct snd_ctl_elem_value *ucontrol)
444 {
445 	ucontrol->value.integer.value[0] = 1;	/* TO DO: Fix me */
446 	return 0;
447 }
448 
aica_pcmswitch_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)449 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
450 			      struct snd_ctl_elem_value *ucontrol)
451 {
452 	if (ucontrol->value.integer.value[0] == 1)
453 		return 0;	/* TO DO: Fix me */
454 	else
455 		aica_chn_halt();
456 	return 0;
457 }
458 
aica_pcmvolume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)459 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
460 			       struct snd_ctl_elem_info *uinfo)
461 {
462 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
463 	uinfo->count = 1;
464 	uinfo->value.integer.min = 0;
465 	uinfo->value.integer.max = 0xFF;
466 	return 0;
467 }
468 
aica_pcmvolume_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)469 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
470 			      struct snd_ctl_elem_value *ucontrol)
471 {
472 	struct snd_card_aica *dreamcastcard;
473 	dreamcastcard = kcontrol->private_data;
474 	if (unlikely(!dreamcastcard->channel))
475 		return -ETXTBSY;	/* we've not yet been set up */
476 	ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
477 	return 0;
478 }
479 
aica_pcmvolume_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)480 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
481 			      struct snd_ctl_elem_value *ucontrol)
482 {
483 	struct snd_card_aica *dreamcastcard;
484 	unsigned int vol;
485 	dreamcastcard = kcontrol->private_data;
486 	if (unlikely(!dreamcastcard->channel))
487 		return -ETXTBSY;
488 	vol = ucontrol->value.integer.value[0];
489 	if (vol > 0xff)
490 		return -EINVAL;
491 	if (unlikely(dreamcastcard->channel->vol == vol))
492 		return 0;
493 	dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
494 	dreamcastcard->master_volume = ucontrol->value.integer.value[0];
495 	spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
496 		    dreamcastcard->channel, sizeof(struct aica_channel));
497 	return 1;
498 }
499 
500 static const struct snd_kcontrol_new snd_aica_pcmswitch_control = {
501 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
502 	.name = "PCM Playback Switch",
503 	.index = 0,
504 	.info = aica_pcmswitch_info,
505 	.get = aica_pcmswitch_get,
506 	.put = aica_pcmswitch_put
507 };
508 
509 static const struct snd_kcontrol_new snd_aica_pcmvolume_control = {
510 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
511 	.name = "PCM Playback Volume",
512 	.index = 0,
513 	.info = aica_pcmvolume_info,
514 	.get = aica_pcmvolume_get,
515 	.put = aica_pcmvolume_put
516 };
517 
load_aica_firmware(void)518 static int load_aica_firmware(void)
519 {
520 	int err;
521 	const struct firmware *fw_entry;
522 	spu_reset();
523 	err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
524 	if (unlikely(err))
525 		return err;
526 	/* write firmware into memory */
527 	spu_disable();
528 	spu_memload(0, fw_entry->data, fw_entry->size);
529 	spu_enable();
530 	release_firmware(fw_entry);
531 	return err;
532 }
533 
add_aicamixer_controls(struct snd_card_aica * dreamcastcard)534 static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard)
535 {
536 	int err;
537 	err = snd_ctl_add
538 	    (dreamcastcard->card,
539 	     snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
540 	if (unlikely(err < 0))
541 		return err;
542 	err = snd_ctl_add
543 	    (dreamcastcard->card,
544 	     snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
545 	if (unlikely(err < 0))
546 		return err;
547 	return 0;
548 }
549 
snd_aica_remove(struct platform_device * devptr)550 static void snd_aica_remove(struct platform_device *devptr)
551 {
552 	struct snd_card_aica *dreamcastcard;
553 	dreamcastcard = platform_get_drvdata(devptr);
554 	snd_card_free(dreamcastcard->card);
555 	kfree(dreamcastcard);
556 }
557 
snd_aica_probe(struct platform_device * devptr)558 static int snd_aica_probe(struct platform_device *devptr)
559 {
560 	int err;
561 	struct snd_card_aica *dreamcastcard;
562 	dreamcastcard = kzalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
563 	if (unlikely(!dreamcastcard))
564 		return -ENOMEM;
565 	err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER,
566 			   THIS_MODULE, 0, &dreamcastcard->card);
567 	if (unlikely(err < 0)) {
568 		kfree(dreamcastcard);
569 		return err;
570 	}
571 	strcpy(dreamcastcard->card->driver, "snd_aica");
572 	strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
573 	strcpy(dreamcastcard->card->longname,
574 	       "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
575 	/* Prepare to use the queue */
576 	INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
577 	timer_setup(&dreamcastcard->timer, aica_period_elapsed, 0);
578 	/* Load the PCM 'chip' */
579 	err = snd_aicapcmchip(dreamcastcard, 0);
580 	if (unlikely(err < 0))
581 		goto freedreamcast;
582 	/* Add basic controls */
583 	err = add_aicamixer_controls(dreamcastcard);
584 	if (unlikely(err < 0))
585 		goto freedreamcast;
586 	/* Register the card with ALSA subsystem */
587 	err = snd_card_register(dreamcastcard->card);
588 	if (unlikely(err < 0))
589 		goto freedreamcast;
590 	platform_set_drvdata(devptr, dreamcastcard);
591 	dev_info(&devptr->dev,
592 		 "ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
593 	return 0;
594       freedreamcast:
595 	snd_card_free(dreamcastcard->card);
596 	kfree(dreamcastcard);
597 	return err;
598 }
599 
600 static struct platform_driver snd_aica_driver = {
601 	.probe = snd_aica_probe,
602 	.remove = snd_aica_remove,
603 	.driver = {
604 		.name = SND_AICA_DRIVER,
605 	},
606 };
607 
aica_init(void)608 static int __init aica_init(void)
609 {
610 	int err;
611 	err = platform_driver_register(&snd_aica_driver);
612 	if (unlikely(err < 0))
613 		return err;
614 	pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
615 					     aica_memory_space, 2);
616 	if (IS_ERR(pd)) {
617 		platform_driver_unregister(&snd_aica_driver);
618 		return PTR_ERR(pd);
619 	}
620 	/* Load the firmware */
621 	return load_aica_firmware();
622 }
623 
aica_exit(void)624 static void __exit aica_exit(void)
625 {
626 	platform_device_unregister(pd);
627 	platform_driver_unregister(&snd_aica_driver);
628 	/* Kill any sound still playing and reset ARM7 to safe state */
629 	spu_reset();
630 }
631 
632 module_init(aica_init);
633 module_exit(aica_exit);
634